package apiday01;

public class StringBuilderDemo {
    public static void main(String[] args) {
        StringBuilder b1 = new StringBuilder();
        StringBuilder b2 = new StringBuilder("abc");

        String str = "abc";
        StringBuilder b3 = new StringBuilder(str);
        String s1 = b3.toString();
        for (int i = 0; i < 10000000; i++) {
            b1.append(i);
        }
        System.out.println("0");
    }
}
